supporter vs pillar

supporter and pillar both are nouns.

Word	Noun	Adjective	Verb	Adverb
supporter	Yes	No	No	No
pillar	Yes	No	No	No

As nouns, pillar is a hyponym of supporter; that is, pillar is a word with a more specific, narrower meaning than supporter:

supporter (noun)	pillar (noun)
a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve)	(architecture) a tall vertical cylindrical structure standing upright and used to support a structure
a support for the genitals worn by men engaging in strenuous exercise	a vertical cylindrical structure standing alone and not supporting anything (such as a monument)
a person who backs a politician or a team etc.	a fundamental principle or practice
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose	a prominent supporter
someone who supports or champions something	anything that approximates the shape of a column or tower